以Q235B钢种为例,对保护渣高温特性对板坯表面裂纹影响进行了研究,发现铸钢的碳当量（∑C）、结晶器液态保护渣的黏度值（η）、拉坯速率平方（vc^2）与板坯的表面裂纹之间有一定关系,即随着ηvc^2/∑C值的增大,板坯出现表面裂纹的几率增大;如果ηvc^/∑C值控制在3.1以下,则板坯一次合格率显著提高。另外,如果结晶器液态渣是长渣（指熔化区间△T≥70℃）,而且是熔化速度比较快（指1 300℃下,v≤60 s）,则出现表面裂纹的几率较大。
The paper studied the effect of high temperature characteristics of mold powder on the slab quality,finding that there is certain relationship between the surface quality of the slab and the carbon equivalent in cast steel（∑C）,the viscosity of flux（η） and the square of casting speed（vc^2）.If the value of ηvc^2 / ∑ C increases,the surface defects of slab appear likely increase.If the value of ηvc^2 / ∑ C controlled in 3.1,the first pass rate of the slab increased significantly.Additionally if flux is long slag（temperature different of the melting zone △T ≥ 70℃）,and melts faster（low than 1300℃,v≤60s）,greater risk of defects is.
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